Definition: You are given a question on high school chemistry. You are also given 4 answer options (associated with "A", "B", "C", "D"), out of which only one is correct. You need to answer the question by selecting the correct option. You should only answer with the choice letter, not the whole answer.
Input: Hard materials such as silicon carbide, used for grinding wheels, are said to be examples of
(A)ionic crystals (B)network crystals (C)metallic crystals (D)molecular crystals

B